Excitons and multi-excitons in heterostructures semiconductor nanocrystals
2009
Multiple excitations in quantum dots core/shell heterostructures are studied via quasi continuous wave multiexciton
spectroscopy method. For ZnTe/CdSe core/shell quantum dots, a transfer from attractive to repulsive biexciton binding
energy is detected as the shell thickness increases, indicating a transfer from quasi type-I to type-II regimes. For
CdSe/CdS seeded nanorods, a transfer from binding to repulsive behavior is detected for the biexciton, accompanied by
significant reduction in oscillator strength of the triexciton transition as core diameters decreases below 2.8nm,
indicating a transition of the electronic excited states from type-I localization in the core to a quasi type-II delocalization
along the entire rod as the core diameter decreases. However, as rods dimensions are decreased, a transfer from repulsive
to binding biexciton energy occurs, demonstrating a change of the system from a quasi type-II to quasi-type-I behavior.
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